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... and blood, and the endoderm (inner layer) forms the gastrointestinal tract of the future mammal. Early in embryogenesis, some cells migrate to the primitive gonad or genital ridge. These are the precursors to the gonad of the organism and are called germinal cells. These cells are not derived from ...

... more simple forms to more complex and developed. Eleven billions years took evolution to reach biological phase, but only three to reach first primitive organisms, and only several hundred millions to reach high developed and later intelligent animals. It is rather sure that it is not only ...

... an opening that becomes the mouth. But the thing is that, as I have found out, there is no archenteron in human embryo at all. In fact, there are primitive node/streak/groove. Besides, that primitive groove is somehow connected to the yolk-sac by means of blastopore (again, wiki says). So how ...

Chapter XLZVIII The "primitive boundary" is simply the limit beteween the tiny droplet, globule, globulet, sphere or quasisphere and its surroundings. Those globules are colloidal, meaning that they're the kind of mixture called ...

Thanks, piscilactovegetarian. You wrote: «Before the first cell there must've been a far simpler structure isolated from its environment by a primitive boundary, but what led to this was not any entirely chemical process but "physical chemistry", a rearrangement of elements involving ...